/*! @file Defines `boost::hana::detail::variadic::reverse_apply_flat`. @copyright Louis Dionne 2013-2017 Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) */ #ifndef BOOST_HANA_DETAIL_VARIADIC_REVERSE_APPLY_FLAT_HPP #define BOOST_HANA_DETAIL_VARIADIC_REVERSE_APPLY_FLAT_HPP #include <boost/hana/config.hpp> #include <boost/hana/detail/variadic/at.hpp> #include <utility> namespace boost { namespace hana { namespace detail { namespace variadic { template <int ...i, typename F, typename ...X> constexpr decltype(auto) reverse_apply_flat_helper(std::integer_sequence<int, i...>, F&& f, X&& ...x) { return static_cast<F&&>(f)( detail::variadic::at<sizeof...(x) - i - 1>( static_cast<X&&>(x)... )... ); } template <typename F, typename ...X> constexpr decltype(auto) reverse_apply_flat(F&& f, X&& ...x) { return reverse_apply_flat_helper( std::make_integer_sequence<int, sizeof...(x)>{}, static_cast<F&&>(f), static_cast<X&&>(x)... ); } }} }} // end namespace boost::hana #endif // !BOOST_HANA_DETAIL_VARIADIC_REVERSE_APPLY_FLAT_HPP